Stalker

Stalker is a movie starring Jane March, Anna Brecon, and Jennifer Matter. A writer struggling with her second novel is terrorised by a homicidal PA.
When novelist Paula Martin retreats to the seclusion of her family home Crows Hall she hopes to clear her mind and focus on her new book. The arrival of an assistant, Linda, should take the pressure off... but as the bodies pile up, Paula finds herself trapped in a terrifying nightmare of murder and madness.